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Induru, R. R.; Davis, M. P. . (2009). Buprenorphine for Neuropathic Pain--Targeting Hyperalgesia. American Journal of Hospice and Palliative Medicine, 26(6), 470–473. doi:10.1177/1049909109341868 
An interview with Sci-Hub Founder Alexandra Elbakyan,Who exactly should pay for academic research